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The Journal of General Physiology, Vol 16, 961-976, Copyright © 1933 by The Rockefeller University Press

ARTICLE

THE COUPLED REDOX POTENTIAL OF THE LACTATE-ENZYME-PYRUVATE SYSTEM

J. Percy Baumberger 1, J. J. Jürgensen 1, and Kathleen Bardwell 1

1 From the Physiology Department, Stanford University, Stanford University

1. The term "coupled redox potential" is defined.

2. The system lactic ion

See PDF for Equation

pyruvic ion + 2H+ + 2e is shown

to be reversible (when the enzyme is lactic acid dehydrogenase) and its coupled redox potential between pH 5.2 and 7.2 at 32°C. is:

See PDF for Equation

3. The free energy of the reaction:

lactic ion (1m) rarr pyruvic ion (1m) = -DeltaF = –14,572.

4. The standard free energy of formation (DeltaF298) of pyruvic acid (l) is estimated at –108,127. This is merely an approximation as some necessary data are lacking.

5. The importance of coupled redox potentials as a factor in the regulation of the equilibrium of metabolites is indicated.

Accepted on April 20, 1933


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